Aim
To determine which of the added materials melts ice the fastest.
Hypothesis
The salt will be the substance that melts ice the fastest.
Materials
- Pencil and Paper
- Blocks of Ice (21 Blocks)
- Plates (identical)
- Measuring Spoon (Tablespoon)
- Timer (or clock)
- Scales
- Syringe
- Materials to test for freezing point depression:
- Salt
- Sugar
- Coffee
- Soil
- Cotton Wool
Method
- The block of ice was measured using the scale to find the initial mass of the ice cube and the ice was then placed on a plate.
- The timer was started immediately as one tablespoon of the substance was sprinkled evenly on the block of ice.
- As the time went on, a syringe was used to extract all the melted water.
- After a period of one hour, the remaining block of ice was placed on the scales, weighed and the results were recorded.
- The above method was repeated for each substance tested until three results were obtained for each test.
- The control was tested by following the same procedure except the ice was left in its pure state without any substance added to it. This was tested three times.
- For each test, the percentage of the ice remaining was calculated: (Remaining mass of ice cube/ Initial mass of ice cube X 100)
- The results were recorded into a table and graphed.